Etymology

protoplanet

P3R1O1T1O1P3L1A1N1E1T1

Today it means: An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets Full definition →

English planet ← Ancient Greek πρωτο- (prōto-) ← Proto-Indo-European *pró
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The story

  1. Proto-Indo-European*per-der.?
  2. Proto-Indo-European*pér
  3. Proto-Indo-European*pró
  4. Ancient Greekπρό (pró)
  5. Ancient Greekπρῶτος (prôtos)
  6. Ancient Greekπρωτο- (prōto-)
  7. Englishproto-
  8. Englishplanet
  9. English todayprotoplanet

From proto- + planet.

Etymology from Wiktionary, CC BY-SA 4.0.